MLX90366 datasheet(19/34 Pages) MELEXIS

19 / 34 page

MLX90366

Triaxis



Position Sensor Assembly feat. SENT

MLX90366

Page 19 of 34

Datasheet

Rev. 1.0

25/Jun/13

13.3.3. Serial message sequence period

Sequence Length

(serial message count)

Sequence Length

(frame count)

Sequence Period

(ms, typical)

144

121

324

273

13.3.3.1. User-defined RAM Value

The payloads of the positions 4, 8 (and 12, 16 if relevant) are user-defined. Three possibilities:

1. Error Code

2. 12 LSBs of a user-defined RAM value

3. 12 MSBs of a user-defined RAM value

The positions 4, 8, 12, 16 refer necessarily to the same user-defined RAM address.

Three RAM addresses are of interest:

The actual absolute Temperature (T) can be derived from the 12 MSBs of ramTempSens (see possibility

3 above) using the following formula (decimal):

T = 8 × (ramTempSens

– 35) + 2048

The accuracy of the actual Temperature is = ± 10 DegC.

13.3.3.2. Error Code Rate

The Error Codes are on purpose transmitted every second message, to maximize the rate, which equals

then 36 SENT frames, when the user-defined RAM mode is not enabled (72 otherwise).

13.3.4. Serial Message Error Code

Bit position

Diagnostic

Comments

GainOOS

Front-end Gain code Out-of-spec (too low, too high)

ADCSatura

Diag

ADCMonitor

ADC monitor

VanaMoni

Analog Internal Supply Too Low

VddMoni

External Supply Too Low, Too High

Rough Offset

Front-end Rough Offset too low, too high

TempMonitor

Temperature Sensor monitor

Variable name

Address

Description

ramTempSens

Calibrated Temperature sensor value

Actual Virtual Gain

Norm

Actual field norm

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